I feed the step right feeds from viterra as well. I don't get them from UFA, but I know my UFA carries one of them, so i'm assuming its available to them. I feed my old guy the senior, its the only thing that's put weight on him. And my younger guys in regular exercise get the complete, I used to feed the peak extruded but it was bit much for my hot gelding. I have a fjord who has a tendency of being fat and he does fine getting the complete in moderation. Have had friends have amazing luck with the hi-fat step 8 as well. Its reasonably priced too. Good luck.
"Riding is a lot like nuts and bolts. if the rider's nuts, the horse bolts."